21062863172 has 24 divisors (see below), whose sum is σ = 39699832536. Its totient is φ = 9720235008.

The previous prime is 21062863141. The next prime is 21062863177. The reversal of 21062863172 is 27136826012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2080636996 + 18982226176 = 45614^2 + 137776^2 .

It is not an unprimeable number, because it can be changed into a prime (21062863177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 621908 + ... + 654900.

It is an arithmetic number, because the mean of its divisors is an integer number (1654159689).

Almost surely, 2^21062863172 is an apocalyptic number.

It is an amenable number.

21062863172 is a deficient number, since it is larger than the sum of its proper divisors (18636969364).

21062863172 is a wasteful number, since it uses less digits than its factorization.

21062863172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45287 (or 45285 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The spelling of 21062863172 in words is "twenty-one billion, sixty-two million, eight hundred sixty-three thousand, one hundred seventy-two".